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Galvanic Cell quiz #1

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Terms in this set (30)

  • What components are present in a Daniell cell?
    A Daniell cell contains a zinc anode, a copper cathode, their respective solutions, and a salt bridge.
  • Which energy conversion occurs in an operating electrolytic cell?
    Electrical energy is converted into chemical energy in an electrolytic cell.
  • What type of reaction occurs at the anode of a voltaic (galvanic) cell?
    Oxidation occurs at the anode of a voltaic cell.
  • At which electrode is aluminum produced in a galvanic cell and in an electrolytic cell?
    Aluminum is produced at the cathode in both galvanic and electrolytic cells.
  • In a fuel cell, which part does 'A' represent: air, anode, cathode, or electrolyte?
    In a fuel cell, 'A' typically represents the anode.
  • Which energy transformation occurs when an electrolytic cell is in operation?
    Electrical energy is transformed into chemical energy during operation of an electrolytic cell.
  • Which of these is a function of a salt bridge in an electrochemical cell?
    A salt bridge maintains electrical neutrality by allowing the flow of spectator ions between half-cells.
  • What moves in the salt bridge from the cathode to the anode in a galvanic cell?
    Negative ions (anions) move from the cathode to the anode through the salt bridge.
  • What is the main purpose of a salt bridge in a galvanic cell?
    The main purpose of a salt bridge is to maintain charge balance and allow the flow of ions to complete the circuit.
  • What happens at the anode during the electrolysis of molten sodium bromide?
    At the anode, bromide ions are oxidized to bromine gas during electrolysis of molten sodium bromide.
  • Which transformation could take place at the cathode of an electrochemical cell?
    Reduction occurs at the cathode, where ions gain electrons and are deposited as solid metal.
  • Which reaction could be used to generate electricity in a voltaic electrochemical cell?
    A spontaneous redox reaction, such as Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s), can generate electricity in a voltaic cell.
  • In which device is chemical energy transformed into electrical energy?
    Chemical energy is transformed into electrical energy in a galvanic (voltaic) cell.
  • What is the cathode in the hydrogen fuel cell?
    In a hydrogen fuel cell, the cathode is where oxygen is reduced.
  • If a galvanic cell is created with silver and chromium electrodes, which metal acts as the anode?
    The metal with the lower reduction potential (chromium) acts as the anode; silver acts as the cathode.
  • What are batteries in the context of galvanic cells?
    Batteries are devices composed of one or more galvanic cells that produce electricity through spontaneous redox reactions.
  • What would happen to the cell potential if you do not use a salt bridge in a galvanic cell?
    Without a salt bridge, charge imbalance would quickly stop electron flow, causing the cell potential to drop to zero.
  • What are the characteristics of standard galvanic cells?
    Standard galvanic cells have Ecell° > 0, ΔG° < 0, ΔS° > 0, and K > 1.
  • Pieces of cadmium and tin are placed in a solution in which [Cd2+] = [Sn2+] = 1.00 M. What is the cell potential (Ecell)?
    The cell potential (Ecell) can be calculated using standard reduction potentials for Cd2+/Cd and Sn2+/Sn under standard conditions.
  • In which component of a galvanic cell are ions deposited onto a solid surface?
    Ions are deposited onto the solid surface at the cathode.
  • How is a galvanic current produced in a galvanic cell?
    A galvanic current is produced by the spontaneous flow of electrons from anode to cathode in a galvanic cell.
  • What is a sign of galvanic corrosion on mounting hardware?
    A sign of galvanic corrosion is visible deterioration or loss of mass at the anode (more reactive metal).
  • Galvanic current is used when __________.
    Galvanic current is used when a spontaneous redox reaction is harnessed to produce electricity.
  • The maximum amount of current used in a galvanic treatment should generally not exceed:
    The maximum current should not exceed the safe operating limits of the cell, typically determined by the cell design and application.
  • A chemist designs a galvanic cell that uses these two half-reactions: Zn2+ + 2e- → Zn(s) and Cu2+ + 2e- → Cu(s). Which is the anode?
    Zinc acts as the anode because it has a lower reduction potential than copper.
  • Write the net cell equation for this electrochemical cell: Zn(s) and Cu2+(aq).
    Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
  • As Ecell° increases, what happens to the spontaneity of the cell reaction?
    As Ecell° increases, the cell reaction becomes more spontaneous.
  • A galvanic cell has the generic metals X and Y as electrodes. If X is the anode and Y is the cathode, which direction do electrons flow?
    Electrons flow from X (anode) to Y (cathode).
  • What is the voltage generated by a zinc concentration cell?
    The voltage is generated by the difference in zinc ion concentrations between the two half-cells.
  • Consider a galvanic cell in which Al3+ ions are present. At which electrode does reduction occur?
    Reduction of Al3+ to Al(s) occurs at the cathode.